High School

The energy required to separate the 3 protons and 4 neutrons in the nucleus of a lithium atom is 39.3 megaelectronvolts. Determine the mass equivalent of this energy in atomic mass units (u).

Answer :

The number of protons or neutrons here don't matter as the energy required is given, which is 39.3 megaelectronvolts (MeV). Using the relation 1 u = 931 MeV, we can convert it to universal mass units. This is shown below:

39.3 MeV x (1 u / 931 MeV) = 0.04221 u

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